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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Jan. 23, 2015	Apr. 25, 2014
Statement Of Financial Position [Abstract]
Accounts receivable, allowances	$ 0.8us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 1.7us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares issued	311.6us-gaap_CommonStockSharesIssued	324.5us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	311.6us-gaap_CommonStockSharesOutstanding	324.5us-gaap_CommonStockSharesOutstanding

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SX 210.5-02.4)

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- Definition

Face amount or stated value per share of common stock.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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X

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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